Steam-boiler furnace.



No. 770,122. PATBNTED SEPT. 13, 1904.

D. L. SHAPFBR. STEAM BOILER FURNAGE.

APPLICATION FILED APR. 2l, 1903.

N0.v MODEL.' 4 SHEETS-SHEET 1.

No. 770,122. EATENTED SEPT. 1s, 1904.

D. E. SEAEEER.

STEAM BOILEE EUEEACE.R APPLICATION FILED APBHZI, 1903.

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l ZZ 2 No. 770,122. PATENTED SEIT. 13, 1904. D. L. SHAPFER.

STEAM BOILEB, PURNAGE'.

APPLICATION FILED APR. 21, 1903.

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n-1.. SHAPFER. STEAM BOILER PURNACB.

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IlllllHl UNTTED STATES Patented September 13, 1904.

PATENT QEETCE.

STEAM-BOILER FURNACE.

SPECIFICATION forming' part of Letters Patent No. 770,122, datedSeptember 13, 1904 Application filed April 2l, 1903.

prove the grate construction of steam-boiler furnaces and provide novelmeans for shaking and cleaning the furnace.

The invention also comprises certain details of construction hereinafterdescribed and claimed.

In the accompanying drawings, Figure 1 is avertical longitudinal sectionthrough a locomotive fire-box constructed according to my invention.Fig. 2 is a transverse vertical s'ection thereof on the line 2 2, Fig.1, showing a modified form of shaker-frame and having parts omitted toavoid confusion. Fig. 3 is a section on the line 3 3, Fig. l.' Fig. I isa plan view of the drop-grate and rocking bar. Fig. 5 is a section onthe line 5 5, Fig. 4;. Fig. 6 is a plan view, and Fig. 7 a transversesection, of a modified form of'drop grate-section and rocking bar. Fig.8 is a plan View, and Fig. 9 a transverse section, of another modifiedform of drop grate-section and rocking bar. Fig. 10 is a bottom view ofthe modified form of shaker-frame. Fig. 11 is a top plan view of thepreferred form of shakerframe. Fig. 12 is a section on the line 12 12,Fig. 11; and Fig. 13 is a vertical section through one of theshaker-prongs and tube to which the same is connected.

In carrying' out my invention the primary object to be gained is anincrease in the heating area of the furnace. As a result the majorportion of the furnace or fire-box is inclosed by a water-jacket, andthis water-jacket also extends underneath the bottom of thefurnace-chamber, thus forming a grate.

In the accompanying drawings my invention has been shown applied to alocomotive- Serial No. 153,676. (No model.)

boiler; but it will be understood that it is equally as well adapted toany other form of fire-flue boiler, whether stationary, horizontal,upright, or of any other type of re-iue boiler. In the drawings thefurnace-chamber or fire-box is shown at 1, this being provided with theusual side sheets 2, crownsheet 3, front or flue sheet 4, and rear sheet5, as is the usual practice in locomotive-boil-` -ers.

Surrounding this fire-box is the usual water-jacket 6, whichcommunicates with the steam -generating space of the boiler, the sheetsabove mentioned forming the inner walls of said water-jacket andsuitable sheets or plates 7 and 8 forming the outer walls of saidwater-jacket.

The usual practice is to connect the inner and outer walls of thiswater-jacket by means of stay-bolts; but in my improved furnace thisconnection is made by stay-tubes lO, which have their inner ends openand communicating with the furnace-chamber, while their outer ends areclosed, as by welding plugs therein. These stay-tubes will be soconnected to the inside and outside walls of the water-jacket as to formperfectly-tight joints.

Interposed between the walls of the waterjacket at ,their lower edges isthe usual mudring 20, which is united to the walls by means of rivets 2lpassing through said walls and ring. These rivets, however, are peculiarin that the inner face of the heads instead of being fiat, as is usuallythe case, are formed tapering or conical, as indicated at 22, and theholes in the sheets will be provided with similar tapering or conicalwalls, so that when the rivets are upset the walls will be drawn tightlyagainst the mud-ring and form a perfectly-tight joint.

In my device the water-jacket forms not only the side and end walls ofthe furnacechamber, but also forms a major portion of the bottomorvfloor thereof. The remainder of the fior or bottom is formed by atipping or drop grate-section, so as to facilitate the cleaning of thefire-box. The water-jacket underneath the furnace is shown at 24:, andit is connected with the waterspace of the boiler, as usual. The top andbottom walls of this water-jacket are connected by stay- TOO tubes 25,which are connected to the walls in any suitable way so as to form atight joint. At theedge of the opening where the drop grate-section isplaced the floor-walls are separated by the mud-ring 2O and united byrivets 21. The water-jacket of the boiler will be provided with suitablecleaning holes which are closed by plugs 26.

I provide suitable fingers or prongs 29, projecting up through thestay-tubes 25 and which are given an up-and-down movement to shake downthe ashes and break up the lire. To accomplish this movement, saidprongs are connected in any suitable way to a skeleton frame 30, formedin any suitable way, such as by longitudinal and cross members, whichmaybe solid bars, as shown in Figs. 2 and 10, but which preferably aretubular, as shown in Figs. 1, 11, 12, and 13. The shaker-frame 3() isengaged by rock-arms 31, pivoted in suitable hangers 32 and having arms33, which are connected, by means of a link or connecting rod 34, to asuitable opering means, such as the lever 35. By moving this lever backand forth the shaker-frame 30 will be raised and lowered, thus causingthe prongs to reciprocate up and down and shake down the ashes and breakup the fire. To reduce friction, the ends of the arms 31 are providedwith rollers 36, which bear against the shaker-frame. Short sections ofchain 37 connect the arms 31 with the shaker-frame, so that if thereshould be any tendency of the shaker-frame to stick when` in theelevated position these chains will pull it down when the rock-arms movedownwardly.

In some cases it may be desirable to introduce a blast, such as air orsteam, to the fire, and when this is desirable such blast can beconveniently introduced by making the shaker-frame 30 and prongs 29hollow or tubular, as shown in Figs. 1 and 11 to 13. The shaker-framewill be provided with a suitable hose connection 38, whereby it can beconnected either to the air-reservoir or to the steam-space of theboiler in order to supply a blast of air or steam to the fire. This willdo away with the necessity for the strong exhaust which is usuallyintroduced in the stack and will prevent the smoke-box becoming cloggedor filled with cinders or charred coal.

The drop grate-section, which preferably will be employed in all largefurnaces, can be made of various'forms. ln Figs. 4 and 5 it is shown asa frame or casting 39, hinged at 40 and having a downwardly-projectingarm 41, to which is connected an operating-rod 42. This grate-sectioncomprises longitudinal side bars 43 and a series of crossconnecting-bars 44. Pivotally mounted in this section is a rocking barwhich comprises a series of transverse fingers 45, secured to therock-shaft 46. The latter has a downwardly-projecting arm, to which isconnected a rod 48, having its rear end connected to operating means,such as a lever. The shaft 46 is so mounted in .the dropsection as to bebelow the top surface thereof, thus protecting said shaft from the heatand also permitting the fingers 45 to sweep the full length of the slotsin the dropsection.

In Figs. 6 and 7 the cross-bars of the gratesection are broken at theirmiddle, so as to present two series of teeth 50, projecting inwardlyfrom the side bars. This construction permits the rocking bar to beinserted from the top of the grate-bar instead of from the bottom. Inorder to strengthen this form of grate-section, a wrought iron or steelrod or band 51 is placed in a groove entirely surrounding thegrate-section. In Figs. 8 and 9 the grate-section comprises a stationarysection 53 and a pivoted or tilting section 54, the rocking bar being'pivotally mounted in the stationary section 53. Various other forms ofgrate-sections may be employed.

Both the connecting-rod 42 for the tilting grate-section and theconnecting-rod 48 for the rocking bar may be connected to the sameoperating means, such as to the lever 56, (shown in Fig. 1,) one of saidconnecting-rods being secured above the fulcrum ofthe lever and theother below the same, so that by operating the lever the grate-sectionand rocking bar will both be oscillated and in opposite directions.

My invention may be modified in details of construction withoutdeparting from the spirit thereof and, as above stated, it is applicableto any form of steam-boiler and is not to be limited to alocomotive-boiler such as shown. With my improved furnace a very largeincrease in the heating-surface is obtained, so that the efficiency ofthe furnace is very greatly increased. Furthermore, the arrangementpresents a convenient means for the introduction of air or steam blastto the fire, this being accomplished by the hollow shaker-frame andfingers. (Shown in Figs. l and 11 to 13.) y y What I claim as myinvention, and desire to secure by Letters Patent, is-

1. A steam-boiler furnace comprising a fire boX or chamber, awater-jacket forming the fioor or grate for a portion of said chamber, adrop-section forming the grate for another portion of said chamber, saidwaterjacket having' passages extending therethrough, fingers or prongsprojecting through said passages, and means for raising and loweringsaid fingers.

2. A steam-boiler furnace comprising a fire box or chamber, adrop-section forming the IOO IIO

grate or floor for a portion of said chamber,

box or chamber, a drop-section forming the floor or grate for a portionof said chamber,

a water-jacket forming the Hoor or grate for the remainder of saidchamber, provided with passages therethrough, a frame provided withfingers or prongs projecting through said passages, rocking arms bearingagainst said frame, and means for rocking said arms to raise and lowersaid frame.

4E. A steam-boiler furnace comprising a lire box or chamber, awater-jacket forming the floor or grate thereof, stay-tubes connectingthe walls of said Water-jacket, ashaker-frame provided with fingers orprongs projecting through said stay-tubes, rock-arms pivotally mountedbelow said frame and bearing against the same, chains or the likeconnecting said arms and frame, and means for rocking said arms.

5. A steam-boiler furnace comprising a fire box or chamber, awater-jacket forming the floor or grate thereof provided with passagestherethrough, hollow prongs projecting through `said openings, and steamor air connections to said prongs.

6. A steam-boiler furnace comprising a fire box or chamber, awater-jacket forming the fioor or grate thereof, stay-tubes through saidwater-jacket, a shaker-frame provided with fingers or prongs projectingthrough said tubes, means for raising and lowering said shaker-frame,said shaker-frame and fingers being hollow and said fingers beingprovided with openings, and air or steam connections to saidshaker-frame.

7. A steam-boiler furnace comprising aA fire box or chamber, a'water-jacket forming the iioor or grate .thereof and provided with anopening therethrough, a metal piece interposed between the top andbottom sheets of the water-jacket around said opening, rivets passingthrough said sheets and interposed metal piece, and a drop grate-sectionlocated in the opening in said water-jacket.

8. A steam-boiler furnace comprising a fire box or chamber, awater-jacket forming the floor or grate for a portion of said chamber, adrop grate-section for the remainder of said chamber, and a rocking barmounted in said drop grate-section.

9. A steam-boiler furnace comprising a fire box or chamber, agrate-section therefor pivotally mounted at one ofits edges, a rocking-bar pivotally mounted in said grate-section with the pivots below thetop surface of said section, and means for oscillating both saidgrate-section and rocking bar.

l0. A steam-boiler furnace comprising a fire box or chamber, agrate-section therefor pivotally mounted at one of its edges, a 'rockingbar pivotally mounted in said grate-section with the pivots below thetop surface of said section, an oscillating lever, and links connectingthe opposite -ends of said lever with said rocking bar andgrate-section.

In testimony whereof I, the said DAvID L. SHAFFER, have hereunto set myhand.

DAVID L. SHAFFER.

Witnesses:

ROBERT C. TOTTEN, G. KREMER.

